There is constant surveillance by employers, corporations, and governments.

People need to communicate with one another while concealing the communication itself. The existing system provides few tools in Wide-area Internet, but parties in close physical proximity may want to use a lightweight tool. Although tools for encrypted communication exist, they serve only to single out privacy-minded individuals as compared to eavesdroppers.

First, the thesis proposes a deniable communication system, Denali. The system leverages an observation of leveraging ubiquitous phenomenon of packet corruption in Wireless networks. The system uses off-the-shelf hardware to provide ease of use for the users.

Second, I present deniable communication system for power-line networks called Power-line Whisperer. The system leverages the presence of physical layer noise in power-line network. The system uses software defined radios to evaluate and demonstrate a novel technique to hide transmissions in noise.

Finally, instead of using computations on a processor to generate signals on the channel, I propose to sense electromagnetic interference on power-line to detect the presence of anomalous activity on processors in IoT devices.